Eric Chitambar

Abstract Quantum networks enable secure communication, distributed computing, and precision sensing beyond classical capabilities. Recent advances have progressed from two-node links to multi-node architectures, enabling rigorous tests of multiparty quantum communication protocols. Among these, quantum secret sharing (QSS) leverages multipartite entanglement to distribute secrets such that only authorized parties can reconstruct them.

An entanglement purification protocol (EPP) aims to transform multiple noisy entangled states into a single entangled state with higher fidelity. In this work we consider input-independent EPPs that always yield an output fidelity no worse than each of the original noisy states, a property we call universality.

Quantum memory systems are vital in quantum information processing for dependable storage and retrieval of quantum states. Inspired by classical reliability theories that synthesize reliable computing systems from unreliable components, we formalize the problem of reliable storage of quantum information using noisy components.